Launch your EC2 EBS instance with two SSDs on the second and third slots (after the root EBS volume), with this in your userdata:


    #!/usr/bin/env bash
    
    umount /dev/xvdb
    umount /dev/xvdc
    apt-get install mdadm -y
    mkdir /u01
    cat > /etc/init/mount-ephermal-ssd.conf  <<HERE
    start on virtual-filesystems
    
    script
      # Attempt a short circuit mount - one of these works 
      # after a reboot
      mount /dev/md127 /u01 && exit 
      mount /dev/md0 /u01 && exit 
    
      # It's possible this was a EC2 STOP/START - create everything from scratch
      # Although we specify md0, the actual device may be md127 upon reboot!!!
      yes | mdadm --create --verbose --force /dev/md0 --level=0 --raid-devices=2 /dev/xvdb /dev/xvdc
    
      # Last chance 
      mount /dev/md127 /u01 && exit  
      mount /dev/md0 /u01 && exit
    
      # Clean FS
      mkfs.ext4 /dev/md0 
      mount /dev/md127 /u01 && exit
      mount /dev/md0 /u01 && exit
    
    end script
    HERE
    
    start mount-ephermal-ssd